6820559609 has 2 divisors, whose sum is σ = 6820559610. Its totient is φ = 6820559608.

The previous prime is 6820559531. The next prime is 6820559617. The reversal of 6820559609 is 9069550286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3584656384 + 3235903225 = 59872^2 + 56885^2 .

It is a cyclic number.

It is not a de Polignac number, because 6820559609 - 2⁸ = 6820559353 is a prime.

It is not a weakly prime, because it can be changed into another prime (6820559309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410279804 + 3410279805.

It is an arithmetic number, because the mean of its divisors is an integer number (3410279805).

Almost surely, 2^6820559609 is an apocalyptic number.

It is an amenable number.

6820559609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6820559609 is an equidigital number, since it uses as much as digits as its factorization.

6820559609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 6820559609 is about 82586.6793678012. The cubic root of 6820559609 is about 1896.4439125716.

The spelling of 6820559609 in words is "six billion, eight hundred twenty million, five hundred fifty-nine thousand, six hundred nine".